Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 3 · 40 questions

Engineer's tip (Rough grips, smooth slides): More friction: rough, dry, grippy. Less friction: smooth, oiled, wet, icy, rolling, powdered. Helpful for grip and braking; a problem when it wears or heats parts. Friction test: bigger force needed → more friction.

1. 1.🛞 Friction acts … (a) with the motion (b) against the motion (c) only upwards (d) only on ice
2. 2.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
3. 3.True or false: a wheel on ball bearings gives less friction. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) a grippy rubber sole (d) skating on ice
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 5 N, a carpet 6 N, sandpaper 10 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a carpet
6. 6.True or false: oil on a squeaky hinge gives less friction. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) a rough doormat (b) sand on a slippery path (c) chalk on a gym bar (d) a wet tiled floor
8. 8.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
9. 9.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 6 N, sandpaper 9 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) sandpaper (d) a glass sheet
10. 10.🛞 Why are tyres made with deep treads? (a) to grip the road (b) to look nice (c) to save rubber (d) to go slower
11. 11.🔍 Which is the odd one out? (a) a box pushed on carpet (b) a rough doormat (c) powder on a carrom board (d) chalk on a gym bar
12. 12.🛞 Rubbing your hands fast makes them … (a) cold (b) magnetic (c) warm (d) wet
13. 13.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
14. 14.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) a problem (b) helpful
15. 15.🔍 Which is the odd one out? (a) a rough doormat (b) a tyre with deep treads (c) a smooth steel slide (d) chalk on a gym bar
16. 16.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) glass (c) polished marble (d) sandpaper
17. 17.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
18. 18.True or false: a smooth steel slide gives more friction. (a) True (b) False
19. 19.True or false: skating on ice gives less friction. (a) False (b) True
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 4 N, a carpet 7 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on ice?
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a wooden plank 6 N, a carpet 7 N, sandpaper 11 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) ice (d) a carpet
22. 22.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
24. 24.True or false: powder on a carrom board gives more friction. (a) True (b) False
25. 25.True or false: oil on a squeaky hinge gives more friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 10 N, sandpaper 12 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 1 N, a wooden plank 2 N, a carpet 4 N, sandpaper 6 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 9 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
29. 29.🛞 More or less friction: oil on a squeaky hinge? (a) more friction (b) less friction
30. 30.🛞 Is friction helpful or a problem here: tyres wearing down? (a) a problem (b) helpful
31. 31.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
32. 32.True or false: skating on ice gives more friction. (a) False (b) True
33. 33.True or false: a tyre with deep treads gives less friction. (a) True (b) False
34. 34.🛞 More or less friction: chalk on a gym bar? (a) more friction (b) less friction
35. 35.🔍 Which is the odd one out? (a) skating on ice (b) a grippy rubber sole (c) a wheel on ball bearings (d) oil on a squeaky hinge
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 3 N, sandpaper 4 N, a glass sheet 1 N, a wooden plank 2 N. How many newtons more were needed on sandpaper than on a glass sheet?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 5 N, a wooden plank 7 N, sandpaper 8 N. Which surface gave the most friction? (a) ice (b) a glass sheet (c) a wooden plank (d) sandpaper
38. 38.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 9 N, ice 4 N, a glass sheet 5 N, a wooden plank 7 N. How many newtons more were needed on a carpet than on ice?
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 6 N, a glass sheet 1 N, a wooden plank 3 N. Which surface gave the least friction? (a) sandpaper (b) a wooden plank (c) a glass sheet (d) a carpet
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 2 N, a glass sheet 3 N, a carpet 7 N, sandpaper 10 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) sandpaper (d) a carpet

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